How to find data from multiple input fields on the server side (Express.js/Node.js)?

I have a form with multiple description text fields, file chose field and submit button for the Cross-Domain request (CORS variant):

  <form class="upload" id="upload_form" enctype="multipart/form-data" method="post" action="http://localhost:3001/upload/1234567890">

      <div class="row-fluid">

        <div class="span5 row-fluid" id="description" style="margin-left:0px;">
          <div>
              <label>Title</label>
              <input class="span12" type="text" placeholder="Title" id="description_title" name="description_title"/>
              <label>Author</label>
              <input class="span12" type="text" placeholder="Author" id="description_author" name="description_author"/>
              <label>Tags</label>
              <input class="span12" type="text" placeholder="Tags" id="description_tags" name="description_tags"/>
              <label>Description</label>
              <textarea class="span12" id="description_textarea" name="description_textarea" rows="5" style="resize:none"></textarea>

              <div id="buttons" class="row-fluid" style="margin-top: 5px">
                  <div class="span12">
                    <span class="span5 btn btn-primary btn-file" id="chose_files_btn" onclick="filechose_button.click()">chose files
                      <input id="filechose_button" type="file" name="fileData" data-url="http://localhost:3001/upload/1234567890"/></span>
                    <button id="upload_button" type="submit" name="upload" class="span5 offset2 btn btn-success" disabled="true" onclick="$('#upload_form').trigger('upload_fired');">upload</button>
                  </div> <!-- span12 -->
              </div> <!-- buttons -->
          </div> <!-- well -->
        </div> <!-- video_description -->
      </div> <!-- row-fluid -->

   </form>

The Node.js (Express.js) server has a route:

app.post('/upload/:id', function(req, res){
    console.log(req.fields);
        ...
});

The problem is, I can not find the data from input fields: req.fields gets undefined.

How can I find the data (text description and a file) from the req on the server?

Update:

Great! req.body really get access to all the fields, BUT:

console.log(req.body)

prints:

{ description_title: 'aaa',
  description_author: 'bbb',
  description_tags: 'ccc',
  description_textarea: 'ddd',
  upload: '' }

but where is the fileData field? I mean, where the file I upload with the description (aforementioned fields)?

Update 2: Done!

Files are not in the body attribute, but in the req.files

Thanks for Adam and andyfan!

You want req.body so long as you have express.methodOverride() in your configuration before the routes.

In your route try console.log(req.body); to see what object you get there. For the route parameters it is req.params.

console.log(object); can be your best friend when trying to find the objects your looking for and the data structure they are contained in.

As said by Adam if you see these two lines 

app.use(express.bodyParser());
app.use(express.methodOverride());

in app.js file of express, then you can read fields as given below.

app.post('/upload/:id', function(req, res){
    console.log(req.body.description_title);
    console.log(req.body.description_author);
    console.log(req.body.description_tags);
    console.log(req.body.description_textarea);
    console.log(req.files);
    res.send("Done!");
});

You can read more about how to handle files in express at this link http://howtonode.org/really-simple-file-uploads